halosulfuron-methyl 12%SC 95%TC weedicide agricultural chemicals pesticide agrochemicals sulfonylurea herbicide weeds

                                                                                          halosulfuron-methyl

Halosulfuron-methyl, also known as permit or a 841101, belongs to the class of organic compounds known as pyrazole carboxylic acids and

derivatives. These are heterocyclic compounds containing a pyrazole ring in which a hydrogen atom is replaced by a carboxylic acid group.

Halosulfuron-methyl exists as a solid and is considered to be practically insoluble (in water) and relatively neutral.

Halosulfuron-methyl is a potentially toxic compound.

Halosulfuron-methyl is a new post-emergence sulfonylurea herbicide for control of broad-leaf weeds and sedges in rice and maize.

On rice, it can be used on submerged field as well as on dry seeded one with a dosage between 22.5 and 37.5 g/ha a.i..

It has proved to be particularly effective against Bolboschoenus spp., Schoenoplectus spp., Cyperus spp., Alisma spp., Bidens spp., Typha spp.,

Ammannia spp. and Lindernia spp.. It can be applied from the stage of 2-4 leaves up to the end of tillering, also in combination with special

products for control of grass weeds, such as Echinochloa spp..

Halosulfuron-methyl shows excellent selectivity to both rice groups (indica and japonica varieties).

On maize, it is applied in post-emergence conditions starting from the stage of 1-2 leaves with a dose between 22.5 and 37.5 g/ha of a.i..

It is particularly effective against Cyperus spp., Abutilon theophrasti, Xanthium spp., Bidens spp., Polygonum spp., Amaranthus ssp..

It shows also an excellent selectivity to maize

Halosulfuron-methyl is the active ingredient in a new class of herbicide which are used for the control of

broadleaf and sedge weeds in corn, turf, sugarcane, and other crops.

The metabolic basis for the corn and wheat selectivity of halosulfuron-methyl was studied using cell suspension cultures and young seedlings.

Both seedlings and cell suspensions were found to completely metabolize halosulfuron-methyl within hours of incubation, suggesting that corn

and wheat tolerance to halosulfuron-methyl was due to rapid metabolism or detoxification.

In marked contrast, in a halosulfuron-methyl sensitive species such as soybean very little metabolism occurred.

The key metabolic route by which corn rapidly inactivates halosulfuron-methyl was found to be hydroxylation of the pyrimidine ring followed by

rapid conjugation with glucose. T

he predominant pathway in wheat was O-demethylation of the methoxy group of the pyrimidine ring.

Further oxidative biotransformation of the early primary metabolites led to the cleavage of the

pyrimidine ring to form pyrazolesulfonamide as a terminal metabolite.